Fixed poor navbar colour choice
Fixed incorrect pluralisation of 'robot'
Refactored 'most viewed' method into concern
Added custom label styling not just for categories
Fixed unreadable text on error messages
Modelled relationship between competitions & users
Added more ways to view competitions
Added error message for pre-voted entry
Refactored navbar into easy-to-understand layout
Changed 'show_by' logic
Check for similar robots before showing them
Show a robot's competitions
Moved meta information to sidebar
Change path to reflect new routing changes